Washington (CNN) - Nearly $285 million was spent by Democrats, Republicans and advocacy groups on political television commercials in the 2010 primaries, and when the dust settles on this midterm election, the final tally could reach $1 billion.
Evan Tracey, president of Campaign Media Analysis, notes history shows that three quarters of the money spent on political TV ads occurs in the final 60 days of the campaign.
The debate over health care reform helped influence the number of political commercials aired in this election cycle. Still, the possibility that Republicans have a shot of winning back the House as well as making substantial gains in the Senate has energized what was once a depressed Republican political base just 20 months ago.
Here is a quick snapshot of the spending on commercials in the primary:
House Democrats, parties and allies: $19 million
House Republicans, parties and allies: $33 million
Senate Democrats, parties and allies: $115 million
Senate Republicans, parties and allies: $117 million